#include <iostream>

using namespace std;

int g_data;

class Person
{
public:
    int m_age;
public:
    void run()
    {
        cout<<"Person::run()"<<endl;
    }

};
#if 0
class Stdent
{
public:
    int m_age;
    int m_no;
public:
    void run()
    {
        cout<<"Person::run()"<<endl;
    }    
    void study()
    {

    }
};
#else
class Stdent : public Person
{
public:
    int m_no;
public:  
    void study()
    {
        cout<<"Stdent::study()"<<endl;
    }
};

#endif
int main()
{
    

    return 0;
}